add rollup and config

Author: timhaywood

package-lock.json

@@ -2,10 +2,23 @@
   "name": "rollup-plugin-ae-jsx",
   "version": "1.0.0",
   "description": "RollupJS plugin to turn output into After Effects compatible `.jsx` JSON files ",
-  "main": "index.js",
+  "main": "dist/rollup-plugin-ae-jsx.cjs.js",
+  "module": "dist/rollup-plugin-ae-jsx.es.js",
   "scripts": {
+    "build": "rollup -c",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
+  "files": [
+    "dist",
+    "src",
+    "README.md"
+  ],
+  "peerDependencies": {
+    "rollup": "^1.20.0 || ^2.0.0"
+  },
+  "devDependencies": {
+    "rollup": "^2.23.0"
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/motiondeveloper/rollup-plugin-ae-jsx.git"

package.json

@@ -0,0 +1,9 @@
+import pkg from "./package.json";
+
+export default {
+  input: "src/index.js",
+  output: [
+    { file: pkg.main, format: "cjs", exports: "auto" },
+    { file: pkg.module, format: "es" },
+  ],
+};